fix: rename hbase-site.xml keys for restserver advertisement

[xeniape]

Description

Follow up to #708

The previous usage of hbase.rest.port by HBase defaulted to port 8080, this is the correct port HBase restserver should listen on internally on the container/Pod. By overriding it in #708 the restserver was listening on the port that was provided by the listener. But this new port should be used for external access not internally, so we can't use the hbase.rest.port key to advertise the restserver to the outside.

This approach was possible in master and regionserver roles, because those two had a patch https://github.com/stackabletech/docker-images/blob/main/hbase/hbase/stackable/patches/2.6.3/0005-Allow-overriding-ipc-bind-port-and-use-alternative-p.patch changing the behavior of the hbase.[master/regionserver].port keys, which are now used for advertising and hbase.[master/regionserver].ipc.port for internal port listening.

Using the same approach for restserver would require adding a similar patch for the restserver as well. @adwk67 and me discussed that it wouldn't make too much sense to put that much work into it before discussing Discovery 2.0, which might change the whole approach anyway.

Instead this PR changes the previously added hbase-site.xml keys so a single hbase.rest.endpoint one, providing the full advertised restserver address and not touch hbase.rest.port default behavior.

Integrationtests passed
🟢 https://testing.stackable.tech/view/02%20Operator%20Tests%20(custom)/job/hbase-operator-it-custom/72/

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[razvan]

one suggestion otherwise it lgtm.

[xeniape]

Release Note

Add hbase.rest.endpoint value to the restserver rolegroup configmap for advertising the restservers.